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EP0309507B1 - Formkörper zum tiefziehen von folien und vergiessen von werkstoffen - Google Patents

Formkörper zum tiefziehen von folien und vergiessen von werkstoffen Download PDF

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Publication number
EP0309507B1
EP0309507B1 EP88902780A EP88902780A EP0309507B1 EP 0309507 B1 EP0309507 B1 EP 0309507B1 EP 88902780 A EP88902780 A EP 88902780A EP 88902780 A EP88902780 A EP 88902780A EP 0309507 B1 EP0309507 B1 EP 0309507B1
Authority
EP
European Patent Office
Prior art keywords
mold
mold body
porous
body according
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88902780A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0309507A1 (de
Inventor
Theodor Hirzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CESSIONE;UNIPOR AG
Original Assignee
UNIPORT POLYESTER-FORMENBAU TH HIRZEL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UNIPORT POLYESTER-FORMENBAU TH HIRZEL filed Critical UNIPORT POLYESTER-FORMENBAU TH HIRZEL
Priority to AT88902780T priority Critical patent/ATE66856T1/de
Publication of EP0309507A1 publication Critical patent/EP0309507A1/de
Application granted granted Critical
Publication of EP0309507B1 publication Critical patent/EP0309507B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
    • B29C51/365—Porous moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/30—Mounting, exchanging or centering
    • B29C33/306—Exchangeable mould parts, e.g. cassette moulds, mould inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3807—Resin-bonded materials, e.g. inorganic particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3814—Porous moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/34—Moulds for undercut articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts

Definitions

  • the invention relates to a porous shaped body according to claim 1, a method for its production according to claim 10 or 11 and uses of the shaped body according to claim 12 or 14.
  • Possible applications for such shaped articles are in the field of film deformation, in particular plastic films and film deep-drawing as such, for example for blister packs or the like. Further applications are molding compounds to be cast, in which a film used as a release agent is provided during casting.
  • One area of application relates in particular to the production of castings from plastic-containing materials, in particular those which contain semolina or granules, but also cement-bound or water-soluble molding compositions.
  • Porous forms made of metal powder and metal powder-ceramic mixtures are known, e.g. from European patent application EP-A 121929 and from Glass & Ceramics, volume 41, No. 5/6, 1984, pp. 238-240. These molds are complex to manufacture because a sintering process at high temperature is necessary.
  • Such sintered forms also have a relatively coarse surface, and there is a risk of the shape being distorted during sintering.
  • the invention is therefore based on the object of creating a porous molded body which can be machined while maintaining the porosity, which is simple to produce and which can have a high surface fineness.
  • the shape according to the invention can be drilled, milled, sawn, ground without clogging the pores. This opens up new opportunities for mold makers to change and manufacture porous molds.
  • the invention further relates to a method for producing a porous molded body according to claim 1.
  • a mixture of metal granules and synthetic resin is molded in a mold to form a block with an initially essentially flat molded body section, and after the synthetic resin has hardened, the actual mold surface is mechanically Processing of the block generated.
  • a block can therefore first be formed from the porous material, in which the actual shape is only subsequently incorporated by the mold maker using known processing techniques, and the porosity of the block material is retained.
  • the thermally held film can be pressed against the shaping surface completely and gently in a matter of seconds during deep-drawing. This enables the film to fit perfectly against all contours of the shaping surface.
  • a molded body of the same quality must be available for high quality products. It often turns out that with complex structures or workpiece shapes, a perfect shaping surface with sufficiently small tolerances cannot be produced straight away. A corresponding rejection of finished molded articles is the result. Since the shaped body according to the invention is special Material composition can be processed mechanically, here is the solution for the production of moldings of the highest quality, in particular with regard to dimensional accuracy and the ability to reproduce the finest surface structures. With the help of a first deep-drawn film section or cast workpiece, undesirable deviations in production can be recognized and the mold can be reworked accordingly. This post-processing can be done in any way, for example by drilling, milling or grinding.
  • the granulate consists of a grain size mixture of 10 ⁇ m to 450 ⁇ m, in a preferred embodiment of 45-160 ⁇ m.
  • the highest demands on the shaping surface of the Shaped bodies can use grain sizes of less than 40-45 ⁇ m; however, since these can only be screened free of dust particles with great effort, their use is reserved for special cases. It is important, as mentioned, that there are no grains of less than 10 ⁇ m in diameter in the granules, since these belong to the dust content of the granules.
  • the granules consist of grains with a complex shape. This leaves pores open even with a high bulk density.
  • the granulate is to be mixed with an initially liquid binder that hardens after processing.
  • This binder consists of a synthetic resin. This avoids the risk of material particles tearing out of the cut surface during subsequent mechanical processing. Epoxy resins have proven particularly useful for this purpose.
  • the mixture of granules and binder should preferably be a so-called "dry mixture”. This means that, after thorough mixing, each granulate is ideally only covered with a thin binder film and e.g. there is no longer any free binder in the cavities of the complex-shaped granules. This also effectively prevents pore clogging.
  • the grains and the binder can be mixed directly; no time-consuming and labor-intensive coating process is necessary, as described, for example, in US Pat. No. 3,166,615.
  • Such a dry mixture occurs when e.g. 83 parts by weight of aluminum granules with grains of 45-160 microns and 17 parts by weight of epoxy resin are mixed.
  • the molded body according to the invention consisting of the materials described above, can be produced in essentially three ways.
  • the mother mold is provided with a release agent; then those parts of the molding surface which do not represent the later shaping surface of the molding to be produced are laminated (this step can also be carried out at the end); Introducing pneumatic lines, inserts and the like, which are to be incorporated directly into the porous molded body, into the mother mold; Compiling and mixing the mixture of granulate and binder well; Pour this mixture into the mother mold, preferably by rubbing it through a sieve; Pounding and shaking the filled mixture in the mother mold in layers and then carrying out a heat treatment depending on the granules and binder used; De-molding of the molded body, release of release agents by washing or grinding and ultimately stamping out to achieve the optimal hardness and / or strength; Covering the outer surfaces of the shaped body, with the exception of its shaping surface, by a surface layer which closes the pores. It should be particularly noted that
  • An additional molded block is applied to an existing porous molded block, which is preferably already equipped with the necessary fittings.
  • This additional molded block can have a shaping surface which is produced by casting or by mechanical processing.
  • the advantage of this third type is that the molded body according to the invention is constructed from modules.
  • a vacuum or cooling module which contains the necessary fittings, forms a basic module that is always reusable.
  • a module with a shaping surface is then attached to this, in that both modules e.g. be roughened and combined with a suitable mixture of granulate and binder. After that, only the outer surfaces of the connection points, which do not belong to the shaping surface, have to be covered with a suitable surface layer. Since the resulting block of moldings can be machined perfectly, the module with the shaping surface can be mechanically separated at any time.
  • the most cost-effective production method for the specific case can always be selected.
  • a decision can be made, for example, based on moldings that are present or on processing devices etc. that are available.
  • the mold maker also has an unlimited opportunity to modify or repair the tool without loss of quality. It is clear that this way Have molds produced quickly and with little effort, which are therefore also suitable for the production of individual pieces, such as samples and prototypes, not least in economic terms.
  • Certain areas behind the molding can be formed by inexpensive, preferably porous, fillers. Coarse-grained or coarse-pored backing is also possible.
  • a porous metal layer can be applied, for example by flame spraying, to increase the abrasion resistance, in particular of sharp-edged contours of the shaping surface.
  • heating and / or cooling elements can be inserted directly into the molded body.
  • guides, fastening elements and the like can be embedded directly in the molded body.
  • the shaping surface can have recesses. Inserts made of the same porous material are inserted into these recesses. However, inserts made of straw, bamboo, leather, etc. are also conceivable.
  • inserts can, for example, have different numbers and can be replaced easily and as often as required. Furthermore, inserts are conceivable which can be withdrawn into the recesses for demolding the workpiece. In addition, inserts which can be displaced in the recesses can be used in the demolding direction with the aid of inserts. This enables workpiece shapes to be realized, which can usually only be produced with split shapes. It is particularly emphasized that the latter variants can only be realized because the porous material consisting of granules and binders can be machined in accordance with the recipe of the present invention. If such inserts had to be produced in the usual way by casting, the costs would be astronomically high.
  • the following advantages are achieved by the shaped body according to the invention: fine, area-tight porosity, so that fine-contoured shaping surfaces and correspondingly fine film deformations are possible; very fine surfaces can be reached, so that no unwanted film grain or structured surfaces have to be accepted; due to the perfect pore distribution, good flow conditions follow, so that high and fast flow rates, good cooling and fast cycle times of film deep-drawing or pouring of plastic-containing casting compounds are possible; Due to the problem-free mold construction, the necessary experience for making holes or nozzles is eliminated, no practical verification attempts are necessary; Cost-effective mold construction, especially from models, is possible, this applies above all to multiple molds; the uniform, volume-tight porosity allows modifications and repairs as well as reworking of the shaping surface, whereby the modified or changed surface sections are consistently of constant quality; and due to the high mechanical strength there is a long service life, so fine contours and thin wall thicknesses are possible.
  • Fig. 1 shows a two-part mold. Shown are the mold parts 1 and 2.
  • the mold part 1 has a vacuum tube 3, which branches into the branches 4 and 5 inside. If vacuum is applied to the vacuum tube 3, an air flow is created in the entire, porous molded body 6, which enters the molded body through the pores of the shaping surface section 8, flows through it and leaves the molded body again through the tube 3.
  • the remaining surface sections (outer surfaces) of the shaped body are covered with a surface layer which clogs the pores and forms a jacket 9, so that air can only enter the shaped body through the shaping surface section 8.
  • the mixture for the shaped body consists of metal granules with a grain size of 10-450 ⁇ m and epoxy resin as a binder in a mixing ratio of 83 parts by weight of granules and 17 parts by weight of resin.
  • the heat treatment is carried out for 12 hours at a temperature of 130 ° C, with a pre and post heat treatment of 6 hours at 60 ° C.
  • the covering thickness of a possible metal covering is of the order of 0.1 mm.
  • the mold part 2 with the molded body 6 ' is designed as a counterpart to the mold part 1. It has a shaping surface section 8 '.
  • a vacuum tube 3 ' serves the same purpose as the vacuum tube 3'.
  • a film can be thermoformed with each of these mold parts, it is easy to see that the present apparatus Potting of plastic-containing materials should serve.
  • the shaping surface sections 8, 8 ' have been covered with a plastic film and are held firmly on these surfaces 8, 8' by means of a maintained negative pressure, for example polymer concrete can be placed in the mold part 1. Since polymer concrete generally has an extraordinarily high viscosity, it is not advisable to distribute the polymer concrete mass only by applying pressure when joining tool parts 1 and 2. It has been shown that the distribution of the polymer concrete mass is easiest with the help of vibrations with only one direction of vibration.
  • the cast workpiece After the cast workpiece has hardened, it can be removed from the mold.
  • the easiest way to do this is to create an overpressure through the vacuum tubes 3, 3 ', which lifts the film formed as a release agent layer from the shaping surface sections 8, 8'.
  • the hardened molding can be removed using the film protruding at the edges.
  • FIG. 2 schematically shows an exemplary embodiment of a molding tool with several sections with a very complicated designed shaping surface 8.
  • a further molding tool part could be used to give the workpiece to be cast, for example a U-shaped cross section, as shown in the example of FIG. 1 give.
  • the porous molded body 6 does not extend through the entire cross section of the molding tool 10. Since certain granules, for example aluminum or copper granules, are quite expensive, a filler can be used in the regions 11 and 12. For example, sand or foam are conceivable. It is important, however, that the shaping surface 8 is surrounded by a region made of porous material in such a way that there can be a perfect air flow through the pores against the branches 4 and 5 of the vacuum tube 3.
  • the surface section 18 has laterally extending depressions, it would not be possible to demold the finished molded workpiece if the insert 17 could not be moved out of the mold 10 during demolding.
  • An insert 19 is inserted into the recess 15.
  • This insert has an individual surface section 20.
  • This surface section also has a laterally extending recess, so that for the demolding of the workpiece it must be ensured that the insert 19 can be drawn into the recess 15. This lateral displacement can be effected by means of the lever 21.
  • the film heated by the heater 28 must not only be pulled down at lightning speed but also uniformly against all shaping surface sections. If this is not done uniformly, there is a risk of excessive thinning of the film in some places, while wrinkles can form in other places. This means not only a uniform flow through the pores of the shaping surface 8, but also a very high evacuation capacity of approximately 80 liters per square meter and second.
  • film holding means 23 are designed as square tubes, which are recessed in the molded body and run along the edge of the shaping surface 8.
  • a surface section of the profiles 23 is preferably to be arranged running in the surface of the molded body.
  • the film holder is done as follows: A film 22 is placed over the molded body. Subsequently, vacuum is generated in the profiles 23, so that an air flow from the outside through the openings 24 into the profiles 23 occurs. So that the film 22 is drawn to the profiles 23 and held by them. As soon as this holder is reliably provided, the heater 28 can be switched on to heat the film 22. Under certain circumstances it may be advisable to support the film by applying a little excess pressure through the pipe 3 until it has become completely soft.
  • the counter body 67 consists of porous material and has a pore-clogging end Surface layer 9 and vacuum or other fittings connections 3 and 68. In this way it is possible to achieve an air flow from the outside through the inner surfaces 69 into the vacuum connection 3. If the molded body 66 is now inserted into the counter body 67, so that the corresponding surfaces 69 and 69 'come to lie on one another, there is a flow effect from the shaping surface 70 of the molded body 66 through the counter body 67 to the vacuum tube 3, as if the interfaces 69, 69 'would not exist.
  • the moldings described are suitable for the processing of polymers and types of concrete and mortar with all common synthetic resin binders, as well as foams, gypsum and similar non-metallic materials, for the production of everyday objects, sanitary articles, technical articles and other molded parts. They are also suitable for the manufacture of polystyrene products and sand molds (cores) for the metal foundry.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Materials For Medical Uses (AREA)
  • Adornments (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Pens And Brushes (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
EP88902780A 1987-04-09 1988-04-08 Formkörper zum tiefziehen von folien und vergiessen von werkstoffen Expired - Lifetime EP0309507B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88902780T ATE66856T1 (de) 1987-04-09 1988-04-08 Formkoerper zum tiefziehen von folien und vergiessen von werkstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1365/87A CH675096A5 (nl) 1987-04-09 1987-04-09
CH1365/87 1987-04-09

Publications (2)

Publication Number Publication Date
EP0309507A1 EP0309507A1 (de) 1989-04-05
EP0309507B1 true EP0309507B1 (de) 1991-09-04

Family

ID=4208720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88902780A Expired - Lifetime EP0309507B1 (de) 1987-04-09 1988-04-08 Formkörper zum tiefziehen von folien und vergiessen von werkstoffen

Country Status (7)

Country Link
US (1) US5061427A (nl)
EP (1) EP0309507B1 (nl)
JP (1) JPH0798337B2 (nl)
AT (1) ATE66856T1 (nl)
CH (1) CH675096A5 (nl)
DE (1) DE3864643D1 (nl)
WO (1) WO1988007921A1 (nl)

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EP4261002A1 (de) * 2022-04-12 2023-10-18 Schock GmbH Giessform zur herstellung eines eine vorder- und eine rückseite aufweisenden giesskörpers aus einer aushärtbaren giessmasse

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US4631228A (en) * 1985-12-16 1986-12-23 Lear Siegler, Inc. Method for making a porous rigid structure and the porous rigid structure made thereby
DE3723021A1 (de) * 1987-07-11 1989-01-19 Alkor Gmbh Verfahren und vorrichtung zur herstellung von formteilen oder gegenstaenden

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919348A1 (de) * 1997-10-28 1999-06-02 Michael Hofmann Verfahren und Vorrichtung zur Herstellung eines Leuchtenglases
EP4261002A1 (de) * 2022-04-12 2023-10-18 Schock GmbH Giessform zur herstellung eines eine vorder- und eine rückseite aufweisenden giesskörpers aus einer aushärtbaren giessmasse

Also Published As

Publication number Publication date
DE3864643D1 (de) 1991-10-10
WO1988007921A1 (en) 1988-10-20
JPH0798337B2 (ja) 1995-10-25
EP0309507A1 (de) 1989-04-05
CH675096A5 (nl) 1990-08-31
ATE66856T1 (de) 1991-09-15
JPH01503129A (ja) 1989-10-26
US5061427A (en) 1991-10-29

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